Some Beatles fans were unhappy that Sean Lennon allowed Lady Gaga to tickle the ivories of a piano given by his father to Yoko Ono, and took to Twitter to register their outrage, MTV.com reported Tuesday.

A photo posted on Sean Lennon’s Twitter page showed Lady Gaga playing the white piano, which John Lennon gave to Ono as a gift. “With gaga at mom’s house, she’s belting on the white piano,” he captioned the photo.

“WHY WOULD YOU LET LADY GAGA PLAY ON JOHN’S PIANO? I’m disappointed,” wrote one Twitter user.

“Would you let just anyone play it? I mean geez, c’mon,” the same user added later.

Lennon responded to the comments, writing, “Pianos meant are to be played. Why is everyone so uptight? What should we do, lock it away in a dusty room? So judgmental.”

Another Twitter user appeared to have deleted her tweets about the photo, but not before Lennon responded. “Firstly, he gave that piano to my mother for her birthday, it is hers, secondly, he was not uptight the way you seem to be,” Lennon wrote. “Come on, lighten up…life’s too short, there’re enough real problems in the world.”

Lennon eventually deleted the photo, in which Lady Gaga was wearing fishnet stockings and a revealing bodysuit.